It increases the height by 3 pixels when going back to HTML edit mode.

I've done the following in toggleSourceEdit. Previously, before the recent change for addressing the scrollbar appearing, the bottom of the scrollbar was not flushed with the bottom of the text area box. Perhaps, there's a 3 pixel miscalculation somewhere.

1. The text area height shrinks for the first Html Editor in this sample
2. The text area height expands on the 2nd Html Editor (last form)
3. The height shrinks for the html editor form in the test-case-5 tool and this is based on the 2nd above and that one expanded